.m-flex {
  display: flex;
  &.is-center {
    align-items: center;
    justify-content: center;
  }
  &.is-align-center {
    align-items: center;
  }
  &.is-align-start {
    align-items: flex-start;
  }
  &.is-align-end {
    align-items: flex-end;
  }
  &.is-align-between {
    align-content: space-between;
  }
  &.is-align-around {
    align-content: space-around;
  }
  &.is-justify-center {
    justify-content: center;
  }
  &.is-justify-start {
    justify-content: flex-start;
  }
  &.is-justify-end {
    justify-content: flex-end;
  }
  &.is-justify-between {
    justify-content: space-between;
  }
  &.is-justify-around {
    justify-content: space-around;
  }

  // flex cell
  &__1 {
    flex: 1;
  }
  &__0 {
    flex-shrink: 0;
  }
}
